Dipole array acoustic logging instrument

Abstract

The invention discloses a dipole array acoustic logging instrument, relates to exploration technology equipment, and particularly relates to logging equipment in the aspect of oil exploration. The dipole array acoustic logging instrument comprises a transmission circuit, a transmitting transducer, a receiving transducer, a sound insulator, an acoustic signal collecting circuit and an acoustic signal processing circuit, wherein the transmission circuit stimulates the transmitting transducer to emit an acoustic wave; the receiving transducer receives the acoustic wave transmitted along the wall of a well; the acoustic signal collecting circuit collects the acoustic wave and then transmits the acoustic wave to the acoustic signal processing circuit to analyze; the sound insulator is composed of a sound insulator connecting block and a sound insulator connecting body; the transmitting transducer is an orthogonal dipole vector transducer; two groups of vector transducers of which the directive properties are vertical to each other form two measurement channels, which are respectively an X-direction channel and a Y-direction channel; the two measurement channels are vertical to each other in circumference. The dipole array acoustic logging instrument has the beneficial effects that 1 gas layer recognition is realized, i.e., the time difference of a longitudinal wave on an air layer section is large in change, but the time difference of a transverse wave is tiny in change. Therefore, the air layer can be detected according to the longitudinal and transverse wave velocity ratio VP / VS.

Description

technical field [0001] The invention relates to an exploration technical equipment, in particular to a well logging equipment for oil exploration. Background technique [0002] Traditional acoustic instruments mainly use the propagation characteristics of sound waves along the borehole wall to measure the porosity of the formation, but in fact the rich formation information contained in the echo has not been utilized. Information such as the arrival time and amplitude of longitudinal waves, shear waves, and Stoneley waves are all closely related to formation lithology, porosity, and permeability. In addition, some formation mechanical characteristic parameters such as formation stress direction can be obtained through sound waves, which can be used to guide drilling. The dipole and multipole acoustic logging developed at present have the characteristics of rich formation information obtained in one downhole, multiple measurement methods, and well solved the problems of acou...

AI Technical Summary

Problems solved by technology

At present, successful instruments have been launched abroad, and a small amount of this type of instrument has been imported at a high price in China. However, due to the high price of instruments and high logging costs, it is difficult to popularize the application of instrument logging

Although many years of research and development have been carried out in China, mature instruments of this type have not yet been released.

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